From experience it is known that a certain brand of tyre lasts, on average, 15 000 miles
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From experience it is known that a certain brand of tyre lasts, on average, 15 000 miles with standard deviation 1250. A new compound is tried and a sample of 120 tyres yields an average life of 15 150 miles. Are the new tyres an improvement? Use the 5% significance level.
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Related Book For
Statistics For Economics Accounting And Business Studies
ISBN: 978027368308
4th Edition
Authors: Michael Barrow
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